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Ultrafast conductivity in a low-band-gap polyphenylene and fullerene blend studied by terahertz spectroscopy
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SYSNO ASEP 0328161 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ultrafast conductivity in a low-band-gap polyphenylene and fullerene blend studied by terahertz spectroscopy Title Ultrarychlá vodivost ve směsi úzkopásového polyfenylenu a fullerenu studovaná terahertzovou spektroskopií Author(s) Němec, Hynek (FZU-D) RID, ORCID, SAI
Nienhuys, H.-K. (NL)
Perzon, E. (SE)
Zhang, F. (SE)
Inganäs, O. (SE)
Kužel, Petr (FZU-D) RID, ORCID, SAI
Sundström, V. (SE)Number of authors 7 Source Title Physical Review. B - ISSN 1098-0121
Roč. 79, č. 24 (2009), 245326/1-245326/7Number of pages 7 s. Language eng - English Country US - United States Keywords time-resolved terahertz spectroscopy ; ultrafast conductivity ; polymer ; solar-cell material Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects GP202/09/P099 GA ČR - Czech Science Foundation (CSF) LC512 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA202/06/0286 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z10100520 - FZU-D (2005-2011) UT WOS 000267699700102 DOI 10.1103/PhysRevB.79.245326 Annotation Time-resolved terahertz spectroscopy and Monte Carlo simulations of charge-carrier motion are used to investigate photoinduced conductivity in a blend of a low-band-gap polyphenylene copolymer and fullerene derivative. The optical excitation pulse generates free holes on polymer chains. We show that these holes exhibit a very high initial mobility as their initial excess energy facilitates their transport over potential barriers on polymer chains. The conductivity then drops down rapidly within 1 ps, and we demonstrate that this decrease occurs essentially by two mechanisms. First, the carriers loose their excess energy and they thus become progressively localized between the on-chain potential barriers—this results in a mobility decay with a rate of (180 fs)−1. Second, carriers are trapped at potential wells with a capture rate of (860 fs)−1. At longer time scales, populations of mobile and trapped holes reach a quasiequilibrium state. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
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